GilaMonster (10/2/2013)Then you can take any combination of file or filegroup backups and providing you have an unbroken log chain covering all of them, you can restore from multiple file/filegroup backups taken at different times.

Let's say I have a backup of the current data filegroup from 10/1 and a backup of the archive filegroup from 7/31. Does that mean to do a restore I need all the transaction log backup files since 7/31?